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diff --git a/docs/envvars.html b/docs/envvars.html
index 60cfd3f0cef..b0c784e924c 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -37,6 +37,7 @@ software driver:
"window" to render into a window, or "disable" to disable the Glide driver.
<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
+<li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.
</ul>